package org.wkg.lesson04;

public class Demo_408 {

    public static void main(String[] args) throws InterruptedException {
        Counter408 counter = new Counter408();
        Counter408 counter1 = new Counter408();
        //在increase与increase方法中，locker作为全局的一个变量，还是同一个锁对象，
        // 在实例化两个类的时候，调用这两个方法，由于是同一把锁，会造成锁竞争

        Thread t1 = new Thread(() -> {
            for (int i = 0; i < 50000; i++) {
                counter.increase();
            }
        });

        Thread t2 = new Thread(() -> {
            for (int i = 0; i < 50000; i++) {
                counter1.increase();
            }
        });

        t1.start();
        t2.start();
        t1.join();
        t2.join();

        System.out.println("count : " + counter.count);
    }


}

class Counter408 {
    public static int count = 0;
    static Object locker = new Object();

    public void increase() {
        synchronized (locker) {
            count++;
        }
    }



}


